It was built by the stars on the
Silent Screen era, and it was in this hotel that the very first Academy
Awards ceremony was held, in 1929.

It's across the street from the current home of the Oscars, the Dolby (Kodak) Theatre. Stars still frequent its nightclubs, and the Hollywood Chamber of Commerce is based here.

In 2012, the Roosevelt Hotel's Tropicana bar hosted the media party for the release of Dexter's 6th SeasonDVD.

Variety described the party scene as:

"Part
Miami hotspot, part grisly crime scene, the Roosevelt Hotel's Tropicana
bar got a serial killer makeover when it played host to Showtime's
"Dexter" season 6 Blu-ray release bash on Tuesday. Decked out in crime
scene tape as crucifixes and candles added to the overall funeral parlor
chic, the party offered guests the opportunity to investigate, or
become, the evidence in one of Mr. Morgan's cases, or take turns driving
the itty-bitty Slice of Life boats that motored around the barside pool
while wearing the party favor of the evening: a pair of blood-drenched
sunglasses."

A. In the early seasons, I
usually had to hunt down the locations after viewing the episodes, using
clues from the various scenes. By the now, though, I've developed
a small group of fans, spies & tipsters who kept an
eye out for Dexter filming in their neighborhoods, and let me know in advance when something is about to film there.

Between those reports, my own personal reconnaissance around town, and a
few new resources I discovered, by the time the new first episode airs, I
already know most (but not all) of the filming locations, and only
need to watch the episodes and match up the scenes with the correct
locations.

This tip came from Rick, who let me know they were filming at the Roosevelt. I'd like to think that I would have recognized it on my own, since I've been there many times - and that Spanish fountain in the lobby is a pretty good clue. But better safe than sorry. (Thanks, Rick!).